Extensible centering and like support



Aprl 22, E941, 4 w. DE vien-:R Y 2,239,315

' EXTENSIBLE cEN'rERING AND LIKE SUPPORT Filed o 14, l193s;

vgffarney Patented pr. 22,v 1941 2,239,315 EXTENSIBLE SIIIILTTERING ANDLIKE PORT William de Vigier, London, England Application October 14,1938, Serial No. 235,085 In Great Britain October 15, 1937 (Cl. 18S- 37)1 Claim.

Many forms of extensible supports have been proposed for use ascentering for example in building construction, that is to say to serveas a temporary scaffold or Wall holding plastic material in positionuntil set, and the present invention is directed to improving supportsof the ikind in assembled together telescope fashion. Such supports, inthe case of floor-making with concrete for example, have flanges at theends temporarily resting upon walls or beams. After the'flooringconcrete has set, the flanged ends of the support are forced free of theWalls or beams by pressure exerted in a direction to shorten thesupport.

According to the present invention the trough sections which have sidewalls extending from the web portion in such a manner that they presentfree margins spaced Widely apart, are tied transversely at intervals toresist spreading or collapse.

The spreading and collapsing of the side walls of the inner troughsection may be prevented by means of fiat straps welded to lengths ofcircular metal bar adapted to be received in and secured to curledmargins of the side walls. The spreading and collapsing of the sidewalls of the companion outer trough section may be prevented by datstraps attached externally to curled margins in which the curled marginsof the inner trough section can slide; or the interaction between thecurled margins of one section with the curled and tied margins of acompanion section may be alone relied on.

In the accompanying drawing, one constructional embodiment of theimproved support is which sheet metal trough sections areV illustrated,Fig. 1 being a side elevation of one half of the support as it appearswhen extended Fig. 2 is a view to a larger s-cale oi the left hand endof Fig. l, Fig. 3 is a corresponding plan and Fig. 4 is a cross sectionthe section being assumed taken at the line 4-4 of Fig. l. As hereshown, the trough sections are invertedffor use as a centering supportin overhead iioor construction; for other uses the troughs may bevariously located, with the bottom vertical for instance, as in wallconstruction.

The walls I of the outer section 2 incline inwardly from a Web portion 3of the shape shown in Fig. 3 the margins 4 of the walls I having asemicylindrical curl which slidingly t the curled margins 5 of the walls6 of the inner trough section. A number of straps 'I are welded to roundbars 8 welded in the curled margins 5 at intervals and 9 are equivalentstraps which may be welded to the outer curled margins 4. To prevent aninner sectionfrom being withdrawn from the outer section, the strap 1 atposition a: Fig. 1 may be provided with a stop I0 adapted to encounter acompanion stop I I attached to the curled margins Il as clearly shown inFig. 4.

What I claim is:

An extensible centering or like support embodying trough sections themargins of the side walls of which are curled to enable one section toslide along the other, lengths of circular metal bars secured in thecurled margins of the side walls of the inner trough section and flatstrips welded to said metal bars to prevent collapse of the .innertrough section.

WILLIAM DE VIGIER.

